@media screen and (min-width: 1099px) {
    .my-panel{
        width: 60%;
    }
}

@media screen and (max-width: 1099px) and (min-width: 768px){
    .my-panel{
        width: 80%;
    }
}

@media screen and(max-width: 768px) {
    .my-panel{
        width: 90%;
    }
}